Body Surface Area Calculator

Body surface area (BSA) is the calculated surface area of the human body. BSA is often used for medical purposes over bodyweight because it can provide a clearer evaluation of the body requirement for energy (metabolic mass).

Since it is difficult to obtain body surface area through direct measurement it is usually determined via a mathematical formula. There are several BSA formulas the most popular was published by D Du Bois and E F Du Bois in 1916 and provides an estimate of the approximate surface area if height and weight are known.

The Du Bois formula is shown below where BSA is in meter2, height is in centimetres and weight is in kilograms:

BSA = 0.007184 * Height^0.725 * Weight^0.425

This calculator uses the above Du Bois formula to provide body surface area calculation.

Here are some other BSA formulas:

Mosteller formula:

BSA = = 0.016667 × W^0.5 × H^0.5

Haycock formula:

BSA = 0.024265 × W^0.5378 × H^0.3964

Gehan and George formula:

BSA = 0.0235 × W^0.51456 × H^0.42246

Boyd formula:

BSA = 0.03330 × W^{(0.6157 - 0.0188 × log10(W))} × H^0.3

Fujimoto formula:

BSA = 0.008883 × W^0.444 × H^0.663

Takahira formula:

BSA = 0.007241 × W^0.425 × H^0.725

Schlich formula:

Women BSA = 0.000975482 × W^0.46 × H^1.08

Men BSA = 0.000579479 × W^0.38 × H^1.24

Mean Male BSA:

Age or age group	metric		imperial
Neonate (newborn)	0.243	m²	2.612	ft²
2 years	0.563	m²	6.060	ft²
5 years	0.787	m²	8.471	ft²
10 years	1.236	m²	13.304	ft²
13 years	1.603	m²	17.255	ft²
18 years	1.980	m²	21.313	ft²
20–79 years	2.060	m²	22.173	ft²
80+ years	1.920	m²	20.667	ft²

Mean Female BSA:

Age or age group	metric		imperial
Neonate (newborn)	0.234	m²	2.519	ft²
2 years	0.540	m²	5.813	ft²
5 years	0.771	m²	8.299	ft²
10 years	1.245	m²	13.401	ft²
13 years	1.550	m²	16.684	ft²
18 years	1.726	m²	18.579	ft²
20–79 years	1.830	m²	19.697	ft²
80+ years	1.638	m²	17.631	ft²

You may also be interested in our BMI calculator.